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Sulfide solid electrolyte

A technology of solid electrolytes and sulfides, applied in solid electrolytes, sulfide conductors, non-aqueous electrolytes, etc.

Active Publication Date: 2015-05-06
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the widely used electrolyte is flammable, it is necessary to install a system to ensure safety

Method used

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  • Sulfide solid electrolyte
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Examples

Experimental program
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Effect test

Embodiment 1

[0046] · Electrolyte synthesis

[0047] In an argon environment, weigh 0.425560g of Li 2 S (manufactured by Nippon Chemical Industry Co., Ltd.), 0.3796162 g of P 2 S 5 (manufactured by Aldrich), 0.125778 g of GeS 2 (manufactured by High Purity Chemical Research Institute Co., Ltd.) and 0.069045 g of Al 2 S 3 (manufactured by High Purity Chemical Laboratory Co., Ltd.), these were put into a zirconia bowl (capacity 45 ml) together with 10 zirconia balls with a diameter of 10 mm, and the bowl was sealed in an argon atmosphere. Then, this bowl was attached to a planetary ball mill (manufactured by FRITSCH, P-7), and it was made to rotate at 370 revolutions per minute, and was mixed for 40 hours. Next, the obtained mixed powder was put into a quartz tube, and the pressure in the quartz tube was reduced until the pressure in the quartz tube reached 30 Pa, and then sealed. Thereafter, the sealed quartz tube was heated at 550° C. for 8 hours, whereby the sulfide solid electrolyt...

Embodiment 2

[0054] The starting material when making the synthesized electrolyte is 0.397341g of Li 2 S (manufactured by Nippon Chemical Industry Co., Ltd.), 0.369102 g of P 2 S 5 (manufactured by Aldrich), 0.220129 g of GeS 2 (manufactured by High Purity Chemical Research Institute Co., Ltd.) and 0.013426g of Al 2 S 3 (manufactured by High Purity Chemical Laboratory Co., Ltd.), and the sulfide solid electrolyte according to Example 2 was synthesized in the same manner as in Example 1 except the above.

[0055] The composition of the sulfide solid electrolyte involved in the synthetic embodiment 2 is Li 3.385 Al 0.035 Ge 0.315 P 0.65 S 4 , the sulfide solid electrolyte involved in Example 2 is M0≈0.05385.

[0056] In addition, X-ray diffraction measurement was performed on the sulfide solid electrolyte related to Example 2 by the same method as in Example 1. show the result in Figure 4 . if will Figure 4 and figure 1 For comparison, they have peaks at the same position. T...

Embodiment 3

[0059] The starting material when making the synthesized electrolyte is 0.403205g of Li 2 S (manufactured by Nippon Chemical Industry Co., Ltd.), 0.414400 g of P 2 S 5 (manufactured by Aldrich), 0.129300 g of SnS 2 (manufactured by High Purity Chemical Research Institute Co., Ltd.) and 0.053094g of Al 2 S 3 (manufactured by High Purity Chemical Laboratory Co., Ltd.), and the sulfide solid electrolyte according to Example 3 was synthesized in the same manner as in Example 1 except for this.

[0060] The composition of the sulfide solid electrolyte involved in the synthetic embodiment 3 is Li 3.4125 Al 0.1375 sn 0.1375 P 0.725 S 4 , the sulfide solid electrolyte involved in Example 3 is M0≈0.18966.

[0061] In addition, X-ray diffraction measurement was performed on the sulfide solid electrolyte related to Example 3 by the same method as in Example 1. show the result in Figure 7 . if will Figure 7 and figure 1 For comparison, they have peaks at the same position....

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Abstract

The main purpose of the present invention is to provide a sulfide solid electrolyte that allows reductive decomposition potential to be reduced to a greater extent than a conventional LGPS sulfide solid electrolyte. The present invention is a sulfide solid electrolyte containing Li, Al, Ge, P and S, such that M0 = M2 / M1 where 0<M0<0.323 (M1: molar fraction of P content; M2: molar fraction of Al content). The crystal structure of the sulfide solid electrolyte is provided with an octahedron (O) formed by Li and S, a tetrahedron (T1) formed by S and X1, and a tetrahedron (T2) formed by S and X2 (X1, X2: elements selected from the group consisting of P, Ge and Al). The octahedron (O) and the tetrahedron (T1) share a ridge, and the octahedron (O) and the tetrahedron (T2) share a vertex.

Description

technical field [0001] The invention relates to a sulfide solid electrolyte. Background technique [0002] Lithium-ion secondary batteries have higher energy density than conventional secondary batteries and can operate at high voltages. Therefore, the secondary battery is used in information equipment such as mobile phones as a secondary battery that can be easily reduced in size and weight. In recent years, the demand for large-scale power applications such as electric vehicle applications and hybrid vehicle applications has also been increasing. [0003] A lithium ion secondary battery has a positive electrode layer, a negative electrode layer, and an electrolyte layer arranged between them. As the electrolyte used for the electrolyte layer, for example, non-aqueous liquid and solid materials are known. When a liquid electrolyte (hereinafter referred to as "electrolyte") is used, the electrolyte easily penetrates into the positive electrode layer and the negative electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01B1/06H01B1/10
CPCH01B1/10H01M10/0525H01M10/0562H01M2300/0068C04B35/547C04B35/62615C04B2235/3203C04B2235/3217C04B2235/3287C04B2235/3293C04B2235/446Y02E60/10H01M10/052Y02T10/70
Inventor 加藤祐树大友崇督菅野了次平山雅章
Owner TOYOTA JIDOSHA KK
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